Borelli Group 3-3.5 Pump Speed Increaser – 90000 Series
The Borelli Group 3-3.5 Pump Speed Increaser – 90000 Series connects gear pumps to the power take-offs of agricultural tractors. With an input speed of 540 rpm and output speeds of up to 3000 rpm, it ensures optimal performance. Built with a cast aluminium and cast iron housing, UNI 18NiCrMo5 steel gears and UNI 16CrNi4 steel shafts, it provides exceptional strength, quiet operation and resistance to continuous operating temperatures of up to 120°C. It requires SAE 90 oil lubrication (maximum capacity 1.80 litres).
The available and configurable product codes are: 90001, 90002, 90003, 90004, 90005.
The hydraulic speed increasers covered by this technical data sheet represent an ideal engineering solution for connecting gear pumps to the power take-offs of agricultural tractors. The standard output speed of agricultural tractor PTOs is typically 540 rpm; therefore, a speed increaser is essential for adjusting this value to the operating speeds required for the proper functioning of hydraulic pumps. The operator may use other input speeds, provided that the maximum output speed of the speed increaser never exceeds 3000 rpm.
The structure and internal mechanical components of the speed increaser ensure reliability and durability under demanding operating conditions. The external housings are manufactured from cast aluminium and high-strength cast iron, providing structural strength and protecting the internal transmission mechanisms.
The internal gears are designed in strict compliance with international ISO/DIN 3990-80 standards. They are manufactured from high-performance UNI 18NiCrMo5 steel. The gear teeth feature a corrected, low-profile design: this specific technical configuration provides greater resistance to mechanical stress and significantly reduces operating noise.
The shafts are manufactured from UNI 16CrNi4 steel. They are connected to the gears through splined couplings, a design solution that provides greater resistance to the torque loads specified in the catalogue and prevents slippage.
The transmission specifications indicate that the torque values provided in the technical tables are calculated for continuous-duty operation. Under intermittent-duty conditions, the system can withstand torque values exceeding the nominal ratings by up to 20%. The devices support a power capacity of 45 kW while maintaining high operational safety standards across various applications and transmission ratios.
Proper lubrication is essential to ensure optimal operation and an extended service life for the mechanical assembly. Only SAE 90 oil must be used. The lubricant level must be visually checked through the dedicated transparent sight glass every 1500 operating hours. The manufacturer requires the first oil change to be performed after the initial 60-80 hours of operation. The maximum oil filling capacity is 1.80 litres. During continuous operation, the temperature must be carefully monitored and must never exceed the critical limit of 120°C.
Installing hydraulic pumps onto the speed increaser requires the use of a coupling half and a specific adapter flange. When ordering or installing the unit, it is essential to specify the flange type and the pump shaft configuration. The Borelli Group 3-3.5 Pump Speed Increaser – 90000 Series supports various adapter flange configurations, including SAE A, SAE B, SAE C and L.G. variants, ensuring highly versatile and modular installation according to the specifications of the hydraulic system.
| Specification | Value |
|---|---|
| Power Take-Off Input Speed | 540 rpm |
| Maximum Output Speed | 3000 rpm |
| Maximum Power | 45 kW |
| Maximum Continuous Operating Temperature | 120°C |
| Lubrication (Recommended Oil) | SAE 90 Type |
| Maximum Oil Capacity | 1.80 litres |
| Housing Material | Cast aluminium and high-strength cast iron |
| Gear Material | UNI 18NiCrMo5 Steel (ISO/DIN 3990-80) |
| Shaft Material | UNI 16CrNi4 Steel |
| Model / Product Code | Power Take-Off Shaft Specifications |
|---|---|
| 90001 | ASAE 1 3/8″ DIN 9611 A |
| 90002 | ASAE 1 3/8″ DIN 9611 |
| 90003 | ASAE 3/8″ DIN 9611 A |
| 90004 | Z 21 16/32 DP |
| 90005 | 48×44 DIN 5482 |